Table 1.
Ingredient, chemical composition (% DM basis), and digestibility of treatment diets
| Item1 | Diet2 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Period 1 | Period 2 | |||||||||||
| CSH | RED | BLU | ONE | ERC | MESQ | CSH | RED | BLU | ONE | ERC | MESQ | |
| Cottonseed hulls | 30.0 | – | – | – | – | – | 14.0 | – | – | – | – | – |
| Ground wood | – | 30.0 | 30.0 | 30.0 | 30.0 | 30.0 | – | 14.0 | 14.0 | 14.0 | 14.0 | 14.0 |
| DDGS | 40.0 | 40.0 | 40.0 | 40.0 | 40.0 | 40.0 | 40.0 | 40.0 | 40.0 | 40.0 | 40.0 | 40.0 |
| Ground sorghum grain | 21.7 | 21.7 | 21.7 | 21.7 | 21.7 | 21.7 | 37.6 | 37.6 | 37.6 | 37.6 | 37.6 | 37.6 |
| Molasses, cane | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 |
| Limestone | 2.2 | 2.2 | 2.2 | 2.2 | 2.2 | 2.2 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 |
| Ammonium chloride | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 |
| Salt | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 |
| Mineral and vitamin premix | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 |
| Nutrient composition, % | ||||||||||||
| DM | 91.9 | 90.8 | 90.6 | 91.6 | 91.4 | 91.2 | 90.6 | 89.6 | 89.9 | 90.1 | 90.0 | 89.7 |
| CP | 18.2 | 18.5 | 18.6 | 17.3 | 18.5 | 18.8 | 19.1 | 19.8 | 19.1 | 18.5 | 19.3 | 19.7 |
| aNDF | 32.6 | 34.8 | 33.2 | 37.9 | 34.6 | 36.6 | 25.4 | 25.7 | 23.1 | 26.3 | 25.6 | 26.6 |
| ADF | 16.4 | 19.9 | 19.0 | 22.7 | 20.4 | 19.7 | 13.5 | 13.6 | 12.9 | 14.7 | 13.3 | 12.1 |
| Ca | 1.2 | 1.4 | 1.4 | 1.3 | 1.3 | 1.4 | 1.2 | 1.4 | 1.3 | 1.3 | 1.2 | 1.4 |
| P | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 |
| Ca:P | 2.3 | 2.7 | 2.9 | 2.8 | 2.9 | 3.0 | 2.4 | 2.7 | 2.8 | 2.7 | 2.5 | 2.9 |
| Ash | 8.1 | 8.0 | 8.5 | 7.7 | 8.5 | 8.4 | 7.8 | 9.1 | 8.3 | 8.0 | 8.1 | 8.5 |
| True IVDMD | 70.8 | 64.4 | 67.1 | 60.8 | 65.0 | 63.6 | 74.6 | 72.6 | 74.7 | 74.8 | 73.2 | 73.8 |
1DDGS = corn-dried distillers grains with solubles are a byproduct of corn ethanol production (POET, Sioux Falls, SD). Mineral premix 3 = NaCl, KCl, S, MnO, ZnO, vitamins A, D, and E, CaCO3, cottonseed meal, cane molasses, and animal fat (Ca = 0.11 to 0.16%; P = 0%; 4 Na 24.6 to 26.5%; Mg = 0%; K = 9.57%; Se = 0%; salt = 64 to 69%); ADICP = acid detergent insoluble CP; True IVDMD = true 48-h IVDMD.
2Goats were transitioned over 29 d onto their respective diets. During Period 1 (days 0 to 26; 48 goats), goats were fed a 70% concentrate ration. Goats were transitioned over 5 d into Period 2 (days 27 to 64; 47 goats) and onto an 86% concentrate ration. Treatment diets were mixed and nonpelleted; ingredient composition differed only by roughage source; either cottonseed hulls (CSH) or ground woody products (RED = Juniperus pinchotii, BLUE = Juniperus ashei, ONE = Juniperus monosperma, ERC = Juniperus virginiana, or MESQ = Prosopis glandulosa). Juniperus spp. (entire above-ground biomass) and P. glandulosa (entire above-ground biomass except for leaves) species were chipped, dried, and hammermilled to pass a 4.76-mm sieve. Monensin (Rumensin 90, Elanco, Indianapolis, IN) was added to each diet at 22 g/t of feed.